- Down-route from Choa Chu Kang Avenue 1 (Bus Stop 44091 - Choa Chu Kang Mkt) towards Choa Chu Kang Interchange:
- 3 buses will perform one (1) down-route trip before Weekdays AM Peak at 0530 hours, 0540 hours and 0550 hours.
- 1 bus will perform one (1) down-route trip before Weekends and Public Holidays AM Peak at 0545 hours.
- Down-route from Choa Chu Kang Avenue 3 (Bus Stop 44079 - Opp Blk 464) towards Bukit Batok Interchange:
- 3 Service 190 DDs (incl. Block 991-190-32) will perform one (1) down-route trip before Weekdays AM Peak at 0636 hours, 0643 hours and 0654 hours.
- Down-route from Bukit Batok West Avenue 3 (Bus Stop 43349 - Opp Princess E Pr Sch) towards Bukit Batok Interchange:
- 4 buses will perform one (1) down-route trip before Weekdays AM Peak at 0530 hours, 0538 hours, 0546 and 0554 hours.
- 4 buses will perform one (1) down-route trip before Weekends and Public Holidays AM Peak at 0530 hours, 0542 hours, 0554 and 0606 hours.
- SMB1320E (Block 451-991-20), SMB1342S & several buses will interline on Service 451 before and during Weekdays AM Peak.
- SMB1320E will perform two (2) crossover trip on Short-Trip 975B during Weekdays PM Peak.
- 4 DDs will perform one (1) short-trip as Short-Trip 991A after Daily PM Peak.
- 3 DDs will perform one (1) short-trip as Short-Trip 991B after Daily PM Peak.
- Several buses will perform crossover trips on Short-Trip 975A during Weekdays PM Peak & PM Off-Peak.
- Several Service 61 DDs will operate on Service 991 on Weekends & Public Holidays.
- This service practises jumpbus & interline with Service 451.
- Weekdays: 9 AM - 9 PM / 4 S1 / 6 TBC (19 buses)
- Weekends: 9 AM - 9 PM / 2 S2 (11 buses)
- External Links:
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